diff --git a/src/keys.ml b/src/keys.ml
index 4d3f8ca4..4d4eac26 100644
--- a/src/keys.ml
+++ b/src/keys.ml
@@ -63,7 +63,7 @@ module Make (Conn : Pg.CONN) (Fs : Fat.FS) : S = struct
         ())
 
   let signkeys () : Signkey.t list result =
-    let now = Timestamp.of_ptime @@ Ptime_clock.now () in
+    let now = Timestamp.of_ptime @@ Mirage_ptime.now () in
     let+ l = Pg.get_signkeys conn ~now |> unwrap_caqti in
     let missing_l, l =
       List.partition
@@ -198,7 +198,7 @@ module Make (Conn : Pg.CONN) (Fs : Fat.FS) : S = struct
         Ok future_dn
 
   let make_future_keys_response () =
-    let now = Timestamp.of_ptime @@ Ptime_clock.now () in
+    let now = Timestamp.of_ptime @@ Mirage_ptime.now () in
     (* get keys from database to filter out keys already certified *)
     let* sk_db_l = Pg.get_signkeys conn ~now |> unwrap_caqti in
     let sk_ht = Hashtbl.create 0xff in
diff --git a/src/mte_info.ml b/src/mte_info.ml
index 9b7f13ab..5fefcdd3 100644
--- a/src/mte_info.ml
+++ b/src/mte_info.ml
@@ -86,7 +86,7 @@ let mk_keys ~db_conn (module Keys : Keys.S) ~last_issue_date =
 
   (* the eddsa pub key used to sign exchange_sig *)
   let* exchange_pub =
-    let now = Timestamp.of_ptime (Ptime_clock.now ()) in
+    let now = Timestamp.of_ptime (Mirage_ptime.now ()) in
     let opt =
       List.find_opt (fun sk -> Signkey.is_valid_at ~timestamp:now sk) signkeys
     in
diff --git a/src/secmod_eddsa.ml b/src/secmod_eddsa.ml
index d0d8d6ca..481a2762 100644
--- a/src/secmod_eddsa.ml
+++ b/src/secmod_eddsa.ml
@@ -175,7 +175,7 @@ let init fs =
         let ht = Hashtbl.create 0xff in
         Ok { fs; sm_key_priv; sm_pub; ht }
   in
-  let now = TimeAbsolute.of_ptime (Ptime_clock.now ()) in
+  let now = TimeAbsolute.of_ptime (Mirage_ptime.now ()) in
   let keys = List.of_seq @@ Hashtbl.to_seq_values t.ht in
   let new_keys = gen_additional_keys_until_lookahead ~now keys in
   List.iter (fun k -> Hashtbl.replace t.ht k.pub k) new_keys;
diff --git a/src/secmod_rsa.ml b/src/secmod_rsa.ml
index d2b9857d..91c7fafd 100644
--- a/src/secmod_rsa.ml
+++ b/src/secmod_rsa.ml
@@ -212,7 +212,7 @@ let load fs =
 
 let init fs =
   let* opt = load fs in
-  let now = TimeAbsolute.of_ptime (Ptime_clock.now ()) in
+  let now = TimeAbsolute.of_ptime (Mirage_ptime.now ()) in
   let* t =
     match opt with
     | Some t -> Ok t
@@ -262,7 +262,7 @@ module Make (Fs : Fat.FS) = struct
     |> list_iter delete
 
   let add section_name t1 t2 =
-    let last_change = Timestamp.of_ptime (Ptime_clock.now ()) in
+    let last_change = Timestamp.of_ptime (Mirage_ptime.now ()) in
     let k = gen_key ~section_name t1 t2 in
     let+ () = write_key t.fs k in
     Hashtbl.replace t.ht k.h_pub k;
diff --git a/src/util.ml b/src/util.ml
index 8d87d47f..99dfe8f0 100644
--- a/src/util.ml
+++ b/src/util.ml
@@ -3,7 +3,7 @@ module Log_reporter = struct
     Logs.Tag.def "Detail tag" ~doc:"" Fmt.string
 
   let detail s = Logs.Tag.(empty |> add detail_tag s)
-  let time_anchor = Ptime_clock.now () |> Ptime.to_span
+  let time_anchor = Mirage_ptime.now () |> Ptime.to_span
 
   let color_of_log_level = function
     | Logs.App -> `White
@@ -35,7 +35,7 @@ module Log_reporter = struct
       let with_detail h tags k user_fmt =
         let detail = Option.bind tags (Logs.Tag.find detail_tag) in
         let timestamp =
-          Ptime.sub_span (Ptime_clock.now ()) time_anchor
+          Ptime.sub_span (Mirage_ptime.now ()) time_anchor
           |> Option.map Ptime.to_float_s
           |> Option.value ~default:0.
         in